Ext.define("MyFirstApp.view.ServerContainer",{
    extend: 'Ext.NavigationView',
    xtype: 'servercontainer',
    config: {
        title: 'Servers',
        iconCls: 'bookmarks',
        badgeText: '2',
        items: [
            {
                xtype:'server'
            }
        ]
    }
});